Any change which alters the composition of the substance is a chemical reaction.
(i) Decomposition reaction:
In Decomposition, a compound breaks into two or more products, usually by heat. e.g. 1. Potassium chlorate on heating decomposes into KCL and liberates oxygen gas.
(ii) Single Displacement reaction:
It is a reaction in which one atom or group of atoms of a compound is replaced by another atom or group of atoms. Example: Zinc replaces Hydrogen in Hydrogen chloride (HCI) to give Zinc chloride.
(iii) Combustion reaction:
It is a reaction in which substances react with the oxygen of air with rapid release of heat and flame. Example: Carbon burns in air and produces carbon dioxide gas and heat is released.
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